package com.nowcoder.community.controller;


import com.nowcoder.community.annotation.LoginRequired;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.FollowService;
import com.nowcoder.community.service.LikeService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

@Controller
@RequestMapping("/user")
public class UserController implements CommunityConstant {

    @Value("${community.path.upload}")
    private String uploadPath;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder; // 从这里面取出用户

    @Autowired
    private LikeService likeService;

    @Autowired
    private FollowService followService;

    private final static Logger logger = LoggerFactory.getLogger(UserController.class);

    @LoginRequired
    @RequestMapping(value = "setting", method = RequestMethod.GET)
    public String getSettingPage(){
        return "site/setting";
    }

    /**
     * 上传头像信息
     * @param headerImage springMVC 自带的上传头像工具产生的对象
     * @param model
     * @return 路径
     */
    @LoginRequired
    @RequestMapping(path = "/upload", method = RequestMethod.POST)
    public String uploadHeader(MultipartFile headerImage, Model model) {
        if(headerImage == null){
            model.addAttribute("error", "您还没有上传图片");
            return "site/setting";

        }
        String fileName = headerImage.getOriginalFilename();
        String suffix = fileName.substring(fileName.lastIndexOf(".")); // 获得上传文件名的后缀
        if(StringUtils.isBlank(suffix)){
            model.addAttribute("error", "文件格式不正确");
            return "site/setting";
        }

        // 生成随机文件名
        fileName = CommunityUtil.generateUUID() + suffix;

        // 确定文件存放路径
        File dest = new File(uploadPath + "/" + fileName);

        try {
            // 存储文件
            headerImage.transferTo(dest);
        } catch (IOException e) {
            logger.error("上传文件失败：" + e.getMessage());
            throw new RuntimeException("上传文件失败，服务器法神异常", e);
        }


        // 更新当前用户的头像路径（web访问路径） http://localhost:8080/community/user/header/xxx.png
        User user = hostHolder.getUser();
        String headerUrl = domain + contextPath + "/user/header/" + fileName;
        userService.updateHeader(user.getId(), headerUrl);
        return "redirect:/index";
    }

    @RequestMapping(value = "/header/{fileName}", method = RequestMethod.GET)
    public void getHeader(@PathVariable("fileName") String fileName, HttpServletResponse response){
        // 服务器存放的路径
        fileName = uploadPath + "/" + fileName;

        // 解析文件后缀
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        // 响应图片
        response.setContentType("image/" + suffix);

        try (
                FileInputStream fis = new FileInputStream(fileName);
                OutputStream os = response.getOutputStream();
        ) {
            byte[] buffer = new byte[1024];
            int b = 0;
            while ((b = fis.read(buffer)) != -1) {
                os.write(buffer, 0, b);
            }
        } catch (IOException e) {
            logger.error("读取头像失败: " + e.getMessage());
        }
    }

    // 个人主页
    @RequestMapping(value = "/profile/{userId}", method = RequestMethod.GET)
    public String getProfilePage(@PathVariable int userId, Model model){
        User user = userService.findUserById(userId);
        if(user == null)
            throw new RuntimeException("该用户不存在");
        model.addAttribute("user", user);
        // 点赞数量
        int likeCount = likeService.findUserLikeCount(userId);
        model.addAttribute("likeCount", likeCount);

        // 查询关注数量
        long followeeCount = followService.findFolloweeCount(userId, ENTITY_TYPE_USER);
        model.addAttribute("followeeCount", followeeCount);

        // 查询粉丝数量
        long followerCount = followService.findFollowerCount(ENTITY_TYPE_USER, userId);
        model.addAttribute("followerCount", followerCount);

        // 查询当前登录用户是否关注该用户
        boolean hasFollowed = false;
        // 判断是否登入
        if(hostHolder.getUser() != null){
            hasFollowed = followService.hasFollowed(hostHolder.getUser().getId(), ENTITY_TYPE_USER, userId);
        }
        model.addAttribute("hasFollowed", hasFollowed);


        return "site/profile";
    }

}